JPS60122816A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To prevent an oil from being dripped when the combustion is terminated and make a substantial reduction of odor in case of diminishing flame by a method wherein an accumulator is arranged in the midway of the oil feeding pipe through a three-way valve. CONSTITUTION:Normally, a three-way valve 17 is normally positioned during combustion in such a way as it may communicate the accumulator 16 with a suction side 19 of a fuel pump 7, and the accumulator 16 keeps a negative pressure under a negative pressure at the suction side 19 of the fuel pump 7. Thereafter, when the combustion is terminated, the fuel pump 7 is stopped and at the same time the three-way valve 17 is changed over to a position where the accumulator 16 is communicated with the oil feeding pipe 8. Therefore, a pressure remained at the discharging side of the fuel pump 7 is decreased in its pressure under a negative pressure in the accumulator 16 at once, a partial oil remained in the oil feeding pipe 8 and the nozzle 9 is flowed backward and suctioned into the accumulator 16. Therefore, after termination of combustion, the oil remained in the nozzle 9 is scarcely left, the oil may not be dripped by the surplus heat of an evaporating cylinder 1, resulting in that the odor in case of diminishing flame can substantially be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vaporizing liquid fuel combustion device.

Conventional Structure and Problems Conventionally, this type of combustion apparatus, as shown in FIG. 1, for example, blows air into a vaporizer cylinder 1 from a case throat 4 sent from a burner fan 2 through an air duct 3. The oil supplied from the pneumatic tank 5 to the oil receiving tray 6 is ejected from the fuel pump 7 through the oil feed pipe 8 and into the carburetor cylinder 1 through the nozzle/I/9. This oil is vaporized by a heater 10 embedded in the vaporization cylinder 1, becomes a mixed gas, and is ejected from the flame port 11, and is ignited and combusted by the electrode 12 and flame rod 13. 141d is an air hose for secondary air, and 15 is a variable air amount damper 15 for switching between strong and weak combustion.

A combustion device with such a configuration has nozzle/L/
The oil in the evaporator cylinder 1 is pushed out by the residual pressure of the fuel pump 7 and drips, and the oil in the scum/l/9 is heated by the residual heat of the vaporizer cylinder 1 (during normal combustion, (The oil is cooled by combustion air.) Due to the heating, the oil expands and drips into the vaporizer cylinder 1, producing a strong extinguishing odor.

OBJECTS OF THE INVENTION The present invention was made in view of the above-mentioned problems, and an object of the present invention is to prevent oil from dripping after combustion has stopped and to reduce fire extinguishing odor.

Composition of the invention In order to achieve the above object, the present invention provides an oil supply system.

There is an accumulator in all stages through a three-way valve.

DESCRIPTION OF EMBODIMENTS One embodiment will be explained below using Figs. 2 to 6. Parts that are the same as those in Fig. 1 will be given the same numbers and explanations will be omitted, and only the different parts will be explained. A branch pipe 18 is connected to the middle of the pipe 8, and an accumulator 16 is provided to this branch pipe 18 via a three-way valve 17. Furthermore, three-way valve 17
A communication pipe 20 connected to the suction side 19 of the fuel pump 7 is connected to the remaining passage.

In the above configuration, during normal combustion, the three-way valve 17 is positioned so as to communicate the accumulator 16 with the suction side 19 of the fuel pump 7, and the accumulator 16 maintains negative pressure due to the negative pressure on the suction side 19 of the fuel pump 7. ing. Thereafter, when combustion is stopped, the fuel pump 7 is stopped, and at the same time, the three-way valve 17 is switched to a position where the accumulator 16 and the oil pipe 1B are communicated with each other, as shown in FIG. Therefore, the residual pressure on the discharge side of the fuel pump 7 is immediately reduced by the negative pressure of the accumulator 16, and the pressure inside the oil pipe 8 and the nozzle /L/9 are reduced.
Some of the oil inside flows back and is sucked into the accumulator 16. Therefore, there is almost no oil remaining in the nozzle 9 after combustion has stopped, and there is no fear of oil dripping due to the residual heat of the vaporizer cylinder 1, and the fire extinguishing odor can be greatly reduced.

In the above embodiment, the three-way valve 17 is a round switching valve, but it may also be a switching valve as shown in FIG. Figure 5・
FIG. 6 shows yet another embodiment, and FIG. 5 shows a cylinder valve 23 fixed to a rod 22 of a switching solenoid valve 21 for switching. Note that the rod 22 is the d-ring 2
It is sealed with 4.

In FIG. 6, an electromagnetic coil 26 is integrated into a three-way valve 17, and switching is performed by a slide valve 27 that slides on the inside. The slide valve 27 is urged in one direction by a spring 28.

Effects of the Invention As described above, the present invention can prevent oil dripping when combustion is stopped and greatly reduce fire extinguishing odor with a simple configuration.

Furthermore, since there is no possibility of oil remaining in parts with a small inner diameter such as the nozzle, it is possible to prevent the formation of tar canes due to residual heat when combustion is stopped, and to completely prevent the nozzle tab 9, etc. It is.

[Brief explanation of drawings]

Figure $1 is a cross-sectional view showing a conventional liquid fuel fi-fi incineration device, the second
The figure is a sectional view of a liquid fuel combustion device according to an embodiment of the present research, FIG. 3 is a sectional view explaining the operation of the same three-way valve, and FIGS. 4 to 6 are cross-sectional views showing other embodiments of the three-way valve. It is a diagram. 1... Carburizer cylinder, 7... Fuel pump, 8...
...Oil pipe, 17 ... Three-way valve, 18
...Branch pipe, 20...Communication pipe.

Claims (1)

[Claims] It is equipped with a carburetor having a heater and a fuel pump that supplies fuel to the carburetor, the outlet of the fuel pump and the carburetor are connected through an oil pipe, and a branch pipe is provided in the middle of the oil pipe. This three-way valve connects one side to the accumulator and the other side to the suction side of the oil feed pump, and also connects the accumulator and the pump suction side during combustion, and simultaneously connects the oil feed pipe and the accumulator when combustion is stopped. A liquid fuel combustion device that switches to communicate with the